check for attached

inject/process.cpp

@@ -69,6 +69,7 @@ void Process::attach()
 
 void Process::detach()
 {
+    check_for_attached();
     if (ptrace(PTRACE_DETACH, pid_, nullptr, nullptr) == -1)
         throw std::runtime_error(std::strerror(errno));
     wait(nullptr);
@@ -164,6 +165,7 @@ void Process::check_for_attached()
 
 void Process::continue_and_wait_for_trap()
 {
+    check_for_attached();
     if (ptrace(PTRACE_CONT, pid_, nullptr, nullptr) == -1)
         throw std::runtime_error(std::strerror(errno));
     int status;